Sand sifter



R. RUEMELIN SAND SIFTER Filed Dec. 8. 1924 S14/venlo@ atto: nu*

Patented ec. i3, i921?.

SEC1-IARD. RUEMELIN, OF MINNEAPOLIS, MN-NESOTA. i

SAND SIFTER;

Application led December rEhe main object of my invention is to provide animproved form of sand sifter that will more quickly and ellici'ently remove dust from sand. Another object is to provide means for dividing a stream of sand from which dust is to be removed into individual streams so the dust can be more readily removed therefrom. Y

VAnother object is to provide means for shifting or partially dcecting the individual streams of sand from side to side, so as to turn the sand over and get the dust carried in the stream, to the bottom thereof where it may pass through the screen.

Another object is to provide step-offs or drops in the screen over which the sand passes so the jolt of the sand in falling over these drops will more readily removethe dust therefrom.

Another object is to provide improved means for bringing the sand to be, screened to the surface of the screen. l

` Another object is to providequickly adjustable means for changing the angle of the screen over which the sand is passed.

lVith these and incidental Objects in view, the invention consists of certain novel features of construction and vcombination of and Figure 3 is a section taken onthe liney 33 Figure 2. As shown in Figure l, the' stand 1 support-s the hopper 2 and adelivery hopper l which tapers toward the bottom and delivers sand through a slot (not shown) to the upper end 6 of the sand screen.

This sand screen may be flat or corrugated,

but I prefer to provide step-offs 7, as better shown in Figure 3, so that when the sand asses over these stepwoffs it will drop and jolt the dust free from the sandand let it pass more readily through the screen 8, which lforms the bottom of the screen proper. The sand is delivered through the slot in a thin stream and passes through the chan-v Vnels 9 between zigfzag division strips 10 willich divide the sand into indivi dual streams and as these strips 10 are zig-.zag as shown in Figures l and 2, the sand shifts from side S, 1924i YSerial No. 754,657.

to side as it passesthrough these individual channels, thus turning or partially detle'cting or rolling the streams of sand over and giving the dust a better chance to work freey from the sand itself and pass through the screen 8, and as heretofore stated', this action is further exaggerated by the step-offs 7;

It will Vbe understood that there may be-'as many division strips l0 asdesired, so as to make the individual streams of sand any desired width.

It may lbe noted that the strips extend substantially the entire length of the screen frame, thus keeping the sand streams sepa# rated throughout their courses and insuring a maximum utilization of the screening'surface. It may be further noted, however, -that it is not the primary object of Zig-Zagging the strips 10 to increase the lengths of the individual streams, as it vmay be` observed from the'line 3 3 in Fig. 2 that 4the main body of the stream may follow a substantially straight path, but there is suflicient abruptn ess in the strip angles to merely receive the sides ofthe stream so as to `deflect or roll them over to the opposite sides, and in this way bring all the sand in contact with the line dust removing meshes.

11 and the posts 120i' the frame have apeI. tures 13 therein to receive the pegs 14, thereby allowing the adjustment of the screen surface quickly andipositively, so as to cause Vthe sand to-pass overv the surface of the screen more or less slowly, as desired.

`While I have' described my invention and illustrated it in one particular design, Ido not wish it understood that I' limit' myself 'to this construction, as it is evident `that the application of the inventionmay be `varied in manyways withinthe scope of the Vfollowing claims. Y

Claims: f

l. In a sand sifter the combination in-v an inclination of sufficient pitch to permit the sand to movedownwardly thereoverby TheV screen 6 is hinged to the framey l at j cluding a normally stationary screen having f I tesa-,aia

gravity when such sand is Vfed to the upper j end of the screen,and unbroken means extending longitudinally and substantially the entireglengthjof the screen, and uponthe upper surface thereof, for dividing the sand into 'separate parallel streams, said means being provided with laterally progreeting portions iter deugen-agg agitat-Lav streams and for laterally acting on the ing the streams laterally as they continue downwardlyV over the screen from end to end thereof.

2. In a sand sitter the combination including a normally stationary screenhaving an inclination of sufficient pitch to permit the sand to move downwardly thereover by gravity, unbroken means extending longitudinally and substantially the entire length of the screen, andupon the upper surt'ace thereof, for dividing-the sand into separate parallel streams and individually guiding the streams, said means being provided with laterally projecting4 portions ttor d'efiectingl and agitating the streams laterally as they continue downward over the screen, and means for adjusting the inclination ot the screen where/by to yvary the speed ot sand streams thereoyer.

' 3. In a sand sitter the combination with supporting means, i an inclinedV normally stationaryy screen arranged to receive sand at its` upper end., unbroken Zig-Zag strips arrangedupon the upper surface of the' screen and extending substantially from top to bottom thereof, Afor dividing the sand into streams, at intervals, as the streams pass down over the screen. t

4'. In a material sitter the combination with supporting means, an inclined'normally stationary screen adapted to receive inaterial at its upper end, unbroken iig-Zag strips arranged upon the upper surface ot the screen and extending` substantially 'from top to bottom thereof, for dividing the material into separate streams and tor laterally acting on the streams, at intervals, as they passdown over the screein means for adjusting the inclination of the screen to vary the gravitational material flow.

5i In a sand sitter the combination in cluding,` a normally stationary screen having an inclination ot suiiicient pitch to permit sand to move downwardly tlier-eoverl by gravity, unbroken means extending longi-` tudinally on the upper face oi:`"the screen and' substantially the entire length thereof, said means being provided withk laterally Aprojecting` portions to vdeflect and agitate the sandy passing over the screen, andV said screen being' stepped 'to impart jolts to the downwardly moving sand.

RICHARD RUEMELN. 

